LONG HYPOCOTYL 5 (HY5) is a central transcription factor that acts downstream of CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1) during light signalling. Here, the authors show that three B-box containing proteins (BBX) are cofactors of HY5 and modulate transcriptional responses for a subset of HY5-dependent processes.
- Katharina Bursch
- Gabriela Toledo-Ortiz
- Henrik Johansson